Aleksandar Razpopov

Welcome

Research

My research interests include:

• Density Functional Theory (DFT)
• Frustrated Magnetism
• Strongly Correlated Systems

Publications

1. Phonon spectrum in the spin-Peierls phase of CuGeO₃
   L. Spitz, A. Razpopov, S. Biswas, H. Lane, S. E. Nikitin, K. Iida, R. Kajimoto, M. Fujita, M. Arai, M. Mourigal, Ch. Rüegg, R. Valentí, B. Normand
   arXiv:2507.12409 (preprint, 2025)
2. Microscopic origin of the magnetic interactions and their experimental signatures in altermagnetic La₂O₃Mn₂Se₂
   Laura Garcia-Gassull, Aleksandar Razpopov, P. Peter Stavropoulos, Igor I. Mazin, Roser Valentí
   arXiv:2506.21661 (preprint, 2025)
3. One-dimensional antiferromagnetic chain in the cation radical salt α-(BEDT-TTF)₂Hg(SeCN)₂Cl
   A. Henderson, A. Razpopov, S. Biswas, R. Valentí, H. Cui, R. Kato, K. Wei, J. van Tol, T. Siegrist, J. A. Schlueter
   CrystEngComm, 2025, Advance Article (2025)
4. Altermagnetic splitting of magnons in hematite (α-Fe₂O₃)
   Rhea Hoyer, P. Peter Stavropoulos, Aleksandar Razpopov, Roser Valentí, Libor Šmejkal, Alexander Mook
   arXiv:2503.11623 (preprint, 2025)
5. Ab initio study of highly tunable charge transfer in β-RuCl₃/graphene heterostructures
   Aleksandar Razpopov and Roser Valentí
   Phys. Rev. Research 6, 043026 (2024)
6. Raman Spectroscopic Fingerprint of Exfoliated S=1 Triangular Lattice Antiferromagnet NiGa₂S₄
   Jazzmin Victorin, Aleksandar Razpopov, Tomoya Higo, Reynolds Dziobek-Garrett, Thomas J. Kempa, Satoru Nakatsuji, Roser Valentí, Natalia Drichko
   Sci Rep 14, 28040 (2024)
7. Growth of self-integrated atomic quantum wires and junctions of a Mott semiconductor
   Tomoya Asaba, Lang Peng, Takahiro Ono, Satoru Akutagawa, Ibuki Tanaka, Hinako Murayama, Shota Suetsugu, Aleksandar Razpopov, Yuichi Kasahara, Takahito Terashima, Yuhki Kohsaka, Takasada Shibauchi, Masatoshi Ichikawa, Roser Valentí, Shin-ichi Sasa, Yuji Matsuda
   Sci Adv. 9, eabq5561(2023)
8. A j_eff=1/2 Kitaev material on the triangular lattice: The case of NaRuO₂
   Aleksandar Razpopov, David A. S. Kaib, Steffen Backes, Leon Balents, Stephen D. Wilson, Francesco Ferrari, Kira Riedl, Roser Valenti
   npj Quantum Mater. 8, 36 (2023)
9. Improved effective vertices in the multi-orbital Two-Particle Self-Consistent method from Dynamical Mean-Field Theory
   K. Zantout, S. Backes, A. Razpopov, D. Lessnich, R. Valenti
   Phys. Rev. B 107, 235101 (2023)
10. Combined experimental and theoretical study of hydrostatic (He-gas) pressure effects in α-RuCl₃
    B. Wolf, D. A. S. Kaib, A. Razpopov, S. Biswas, K. Riedl, S. M. Winter, R. Valentí, Y. Saito, S. Hartmann, E. Vinokurova, T. Doert, A. Isaeva, G. Bastien, A. U. B. Wolter, B. Büchner, M. Lang
    Phys. Rev. B 106, 134432 (2022)
11. Microscopic origin of magnetism in monolayer 3d transition metal dihalides
    Kira Riedl, Danila Amoroso, Steffen Backes, Aleksandar Razpopov, Thi Phuong Thao Nguyen, Kunihiko Yamauchi, Paolo Barone, Stephen M. Winter, Silvia Picozzi, and Roser Valentí
    Phys. Rev. B 106, 035156 (2022)
12. Multi-Center Magnon Excitations Open the Entire Brillouin Zone to Terahertz Magnetometry of Quantum Magnets
    Tobias Biesner, Seulki Roh, Aleksandar Razpopov, Jannis Willwater, Stefan Süllow, Ying Li, Katharina M. Zoch, Marisa Medarde, Jürgen Nuss, Denis Gorbunov, Yurii Skourski, Andrej Pustogow, Stuart E. Brown, Cornelius Krellner, Roser Valentí, Pascal Puphal, Martin Dressel
    Quantum Magnets. Adv. Quantum Technol., 5 (2022)
13. Electronic and magnetic properties of the RuX₃ (X=Cl, Br, I) family: two siblings – and a cousin?
    David A. S. Kaib, Kira Riedl, Aleksandar Razpopov, Ying Li, Steffen Backes, Igor Mazin, and Roser Valentí
    npj Quantum Materials 7, 75 (2022)
14. Phase diagram of a distorted kagome antiferromagnet and application to Y-kapellasite₃
    Max Hering, Francesco Ferrari, Aleksandar Razpopov, Igor I. Mazin, Roser Valenti, Harald O. Jeschke, Johannes Reuther npj Comput. Mater. 8, 10 (2022)
15. Giant pressure-enhancement of multiferroicity in CuBr₂
    J. S. Zhang, Yiqi Xie, X. Q. Liu, A. Razpopov, V. Borisov, C. Wang, J. P. Sun, Y. Cui, J. C. Wang, X. Ren, Hongshan Deng, Xia Yin, Yang Ding, Yuan Li, J. G. Cheng, Ji Feng, R. Valenti, B. Normand, Weiqiang Yu
    Phys. Rev. Research 2, 013144 (2020)

Teaching

• SS 25: Theoretische Physik IV: Quantenmechanik I
• WS 24/25: Theoretische Physik III: Elektrodynamik
• WS 23/24: Theoretische Physik III: Elektrodynamik
• SS 23: Einführung in die Programmierung für Studierende der Physik
• WS 22/23: Mathematik für Studierende der Biophysik
• SS 22: Theoretische Physik VI: Quantenmechanik II
• WS 21/22: Theoretische Physik V: Thermodynamik und Statistische Physik
• SS 21: Theoretische Physik IV: Quantenmechanik I
• WS 20/21: Theoretische Physik III: Elektrodynamik
• SS 20: Theoretische Physik IV: Quantenmechanik I
• WS 19/20: Theoretische Physik V: Thermodynamik und Statistische Physik
• SS 19: Theoretische Physik IV: Quantenmechanik I
• WS 18/19: Theoretische Physik V: Thermodynamik und Statistische Physik

Contact

Address:
Institut für Theoretische Physik
Goethe-Universität Frankfurt
Max-von-Laue-Strasse 1
60438 Frankfurt am Main
Germany

Office: 01.139

Phone: +49-69-798-47825

Fax: +49-69-798-47832

Email: razpopov [at] itp.uni-frankfurt.de